Madrid , Spain -LRB- CNN -RRB- -- A Spanish court is requesting an arrest warrant for alleged Nazi war criminal John Demjanjuk .

In a ruling dated January 7 but released Friday , Spanish Judge Ismael Moreno Chamarro said Demjanjuk is accused of being `` an accomplice to the crimes of genocide and crimes against humanity . ''

The indictment said more than 150 Spaniards were imprisoned at the Flossenburg concentration camp , where Demjanjuk allegedly was a guard . Sixty of them died , according to evidence cited in the judge 's ruling .

The ruling orders that a European arrest warrant be issued for Demjanjuk , who is currently on trial in Germany on charges of being an accessory to thousands of murders during World War II . He was extradited there from the United States in 2009 .

Demjanjuk lost a U.S. Supreme Court case against his deportation . His lawyers had asked the high court to consider their claims that he was too ill and frail to be sent overseas . They also raised human rights and other legal issues .

In the German trial , his defense attorney there has argued that the court was imposing a `` moral and judicial double standard . ''

The retired auto worker from Cleveland , Ohio -- a native Ukrainian -- was a prisoner of war during the conflict , and would have been killed had he not done what the Nazis ordered , the defense team argued in 2009 .

The Munich state prosecutor brought the charges against Demjanjuk for his alleged role at the Sobibor death camp in Poland , where the Nazis and their accessories killed at least 167,000 people , according to the U.S Holocaust Memorial Museum .

Relatives of victims have joined the prosecution 's case in Germany .

The accusations against Demjanjuk date to the late 1970s , when the U.S. Justice Department accused him of being a Nazi guard known as `` Ivan the Terrible . '' His U.S. citizenship was revoked in 1981 , and he was extradited to Israel in 1986 .

Demjanjuk was convicted in an Israeli court in 1988 and sentenced to death , but that conviction was overturned in 1993 amid evidence that someone else was `` Ivan the Terrible . ''

A federal court restored Demjanjuk 's citizenship , ruling the government withheld evidence supporting his case .

But his citizenship was revoked again in 2002 after a federal judge ruled his 1952 entry into the United States was illegal because he hid his past as a Nazi guard .

CNN 's Al Goodman contributed to this report .

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A Spanish judge says man was a guard at a concentration camp where 60 Spaniards died

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He is on trial in Germany on charges of being an accessory to thousands of murders

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He was extradited to Germany from the United States in 2009

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Demjanjuk 's lawyers have argued that he was a prisoner of war during the conflict